Device for projecting photographic slides held by a rectangular filing plate frame



5. 1968 YOSHICHIK SAKAMOTO 3,409,352

DEVICE FOR PROJECTING OTOGRAPHIC SLIDES HELD BY A RECTANGULAR FILINGPLATE FRAME Original Filed June 18, 1965 2 Sheets-Sheet 1 F/'g. Fig.2

INVENTOR i 5 V08/9/6H/M4 54%4/14070 ATTORNEY Nov. 5, 1968 YOSHICHIKASAKAMOTO 3,409,352

DEVICE FOR PROJECTING PHOTOGRAPHIC SLIDES HELD BY A RECTANGULAR FILINGPLATE FRAME riginal Filed June 18. 196

2 Sheets-Sheet 2 INVENTOR Vosw/c/mm JAkAMOTd ATTORNEY United StatesPatent 3,409,352 DEVICE FOR PROJECTING PHOTOGRAPHIC SLIDES HELD BY ARECTANGULAR FILING PLATE FRAME Yoshichika Sakamoto, 214 2-chome,Sengen-cho, Ohmiya, Japan Original application June 18, 1965, Ser. No.465,040. Divided and this application Aug. 31, 1967, Ser.

No. 671,909 Claims priority, application Japan, Feb. 15, 1965,

40/ 8,219 3'Claims. (Cl. 353-25) ABSTRACT OF THE DISCLOSURE A device forprojecting film slides comprises a housing having a projection windowin, its top, and a light source and condenser lenses in the housing fordirecting light upwardly through the window, in combination withprojection lenses and mirrors above the window for directing the lightonto a screen. A rectangular filing plate frame in and from which filmslides to be viewed are individually insertable and removable in aplurality of rows has recesses on its underside, and the housing top hascorresponding projections that fit into the recesses to register anyselected slide precisely with the window. A translucent viewing screenwithin the device receives the image from a mirror, and that mirror isvertically swingable to an inoperative position to permit projection ofthe image alternatively ,on a wall screen.

This application is a division of my copending application Ser. No.465,040, filed June 18,1965, now abandoned.

This invention relates to a device for directly projecting aphotographic slide, more particularly color film slides as filed in apartly translucent filing plate frame of a number of color films.

The convenience in using rectangular plate frames for filing a number ofcolor film slides has been recognized recently and such filing plateframes havebeen used widely.

Said filing plate frame is usually made of synthetic resin sheet orthick paper board by die molding or shaping into rectangular form andprovided with a number of rectangular recesses to file and holdphotographic slides in a lattice disposition one in each recess, wherebyslides can be kept in good order, handled and checked easilyand selectedand viewed conveniently. Furthermore, a number of such filing plateframes may be bound together for use as an album with great advantage tokeep slides in good order. 1

However, the conventional practice of projecting film slides kept insaid filing plate frame has been to select and take off the slides oneby one from said recesses of the filing plate framearid such slides mustbe returned to respective recesses again one by one after projection isfinished, which was a rather troublesome procedure .in projecting filmslides.

The principal object of the invention is to obviate said troublesomeprocedure by providing a device capable of projecting any slide as heldin a filing plate frame and thereby to simplify the projectingprocedure.

Another object of the invention is to provide a simplified procedure forselecting a desired slide out of a number of slides held in said filingplate frame.

A still further object of the invention is to provide a projectingdevice having means to simultaneously illuminate all photographic slidesheld by the filing plate frame for enabling proper selection of adesired slide with ease while keeping the ability of producing a clearprojected image of the selected slide, whereby it is made possible toreview all contents of said slide filing plate frame while projecting acertain slide therein and thus lectures using slides are considerablysimplified.

Yet another object of thepresent invention is the pro vision of such aprojecting device, in which individual slides in a filing plate framecan be easily and accurately registered with the light source. Theinvention also contemplates the provision of. a projecting device inwhich the image can be viewed alternatively on a relatively small screenwithin the device or a relatively large screen outside the device. 1

The projecting device of the invention is characterized a in that arectangular filing plate frame holding a number of slides in a latticedisposition is inserted and held-in said projecting device between agroup of condenser lenses and a projecting lens in such a manner thatsaid filing plate frame can be shifted in two directions crossing witheach other at a right angle to facilitate selection and projection ofany slide therein as it is held in said fiiing plate frame.

For a better understanding of the invention reference is made to theaccompanying drawings, in which FIGS. 1 and 2 are a side view and a rearview, respectively, of one embodiment of the invention;

FIGS. 3, 4 and 5 are a side view, a rear view, and a plan view,respectively, of another embodiment of the invention;

FIGS. 6 and 7 are a side view and a plan view, respectively, of a screenbox for use with the embodiment of FIGS. 3-5;

FIG. 8 is a diagrammatic perspective view illustrating the assembly of agroup of reflecting mirrors; and

FIG. 9 is an enlarged fragmentary perspective view of a portion of theapparatus shown in FIGS. 1 and 2.

Referring now to the drawings in greater detail, there is shown arectangular filing plate frame 1, best seen in FIG. 9, having a numberof slide-receiving pockets in a lattice disposition, 1 being anindividual film slide to be held in a said pocket, with one film slidedisposed in each pocket. The flat panels of the filing plate frame aretranslucent, although it will be understood that it is permissible toprovide a suitable window in each recess so that the projector lightbeam may be directed directly through photographic slides withoutpassing through a translucent panel of the filing plate frame.

The projector also comprises a housing 14 for the light source system ofthe slide projector; having a horizontal light source window 15. A lightsource lamp is indicated 1 at 23, as best seen in FIGS. 3 and 5, and agroup of conwhich is to say spaced apart a whole-number multiple of thesize of the slide pockets, in order to hold the filing plate frame 1rigidly. A milk-white translucent plate 29 mounts the light sourceWindow 15 therein and is sup ported by the inner edges 28 of thestraight projections 27. In addition, a table board 30 is providedsurrounding translucent plate 29. Window 15 is on the same level astable board 30.

A projection lens 33 is located in opposition to the I light sourcewindow 15. Lens 33 is disposed in a cylinder depending from a supportingarm 34 extending from houssaid arms 34 and 35 is hollow and serves as aradiator of heat generated by the light source lamp 23.

. A mirror 36 is placed directly above the projection lens33 with aninclination of 45 degrees withrespect to a vertical plane parallel tothe screen or surface on which the image is to be projected, in order toreflect the generally vertical light flux from the projection lens33.-In addition, mirrors 37 and 38 are so placed as to. reflect saidlight flux from the mirror 36 toward the exterior screen (not shown),that is, the general direction of the light flux from the mirror 36 isreversed about 180 degrees to proceed approximately horizontally towardthe external screen when leaving the mirror 38. In FIG. 8, a supportingplate 39 secures mirrors 36 and 37in proper mutual relationship andmounts the group of mirrors 36, 37 and 38 on the supporting arm 34 bymounting means (not shown).

It 'it thus apparent that the light beam from the projection lens 33afterpassing through the slide 1 is reflected by means of said series ofmirrors 36, 37, 38 and projected passing by the supporting arm 34 andalong the path 1, p to produce the image of the desired slide on theexternal screen. The light coming through the translucent plate 29illuminates all the slide pictures in the filing plate frame I placed onthe horizontal table board 30 to enable the operator to have a directview of said pictures from the back of the projecting device for thepurpose of careful review in the course of lecturing or explaining. Saidillumination also helps to make proper selection of the desired picture.The selection of the desired picture is made by shifting said filingplate frame 1 horizontally and by engaging grooves 26 of the filingplate frame with linear projections 27 on top of the housing 14, therebybringing a desired slide to a position directly above the light sourcewindow 15.

According to the above-explained construction of the slide projector ofthe invention, the operator can see the pictures in the plate frameother than that which is projected on the screen at each moment, andthus he can make a speech on many more related pictures than in the caseof using a conventional projector.

As best seen in FIGS. 1 and 2, a screen housing 41 is mounted on thevertical arm 35 of the slide projector. With screen housing 41, theoperator may see the picture prior to projection, and he can show thepicture to a small audience on a small scale. To this end, an additionalmirror 42 is pivoted on a horizontal axis 43 and interrupts the lightbeam at a point between the mirror 38 and the external screen andchanges the direction of the light beam from the path p to the path Q asshown in FIGS. 1 and 3, to produce the image of the desired slide on thescreen 44. When said additional mirror 42 is swung and kept in theposition 42 shown in FIG. 1 by rotating mirror 42 about axis 43, theslide picture can again be projected on the external screen.

FIGS. 3 to show another embodiment of the invention using a removablescreen housing, and FIGS. 6 and 7 show the removable screen housingproper.

The screen housing 41 of the latter embodiment comprises a series ofbent side surfaces 45, 46 and 47 formed along the shape of the housing14 of the light source system, a base 49 having a hook 48 to connect twohousings 14 and 41, a connector 50 extending upward from the rearportion of said base 49 approximately parallel to said verticalsupporting. arm 35 ofsaid housing 1410f the light source system, and afixed reflecting mirror 42 mounted on the front portion of saidconnector 50. The light beam of the slide picture is bent from the pathp to the path Q by means of the reflecting mirror 42 to produce theimage ofthe picture on the screen 44' according to the same principle asin the preceding embodiment.

It is preferable in this latter embodiment to make the surface of thehousing 14 of the light source system that contacts the base 19 coincidewith the bent su rfa ces 45, 46and47,

As described in the foregoingfthe device of the invention Provides meansto select andproject a slide as held in the rectangular filing plateframe holding a number of slides in a lattice disposition by moving saidfiling plate frame in two directions crossing each other at a rightangle, and thus improves the slide projection techniques greatly whilekeeping all advantages of the slide filing plate frame system.

It will therefore be apparent that all of the initially recited objectsof the present invention have been achieved.

Although the present invention has been described and illustrated inconnection with preferred embodiments, it is to be.understood.thatmodifications and variations may be resorted to without departing fromthe spirit of this invention, ,as those skilled in this art will readilyunderstand. Such modifications and variations are considered to bewithin the purview and scope of the present invention as defined by theappended claims.

' Having described my invention, I claim:

1. A device for projecting film slides, comprising a housing having ahorizontal top, a projection window disposed in said horizontal top, alight source and condenser lenses in said housing for projecting lightup through said window, filing plate frame having a plurality of pocketsfor holding a plurality of film slides in a plurality of rows, saidhorizontal top having upwardly extending projections spaced apart awhole-number multiple of the size of the slide pockets, said filingplate frame having downwardly opening recesses between said slidepockets for receiving said upwardly extending projections on the top ofthe housing, thereby accurately to locate a selected slide with respectto said window.

2.'A device as claimed in claim 1, said top of said housing between saidupwardly extending projections being comprised by a translucent plate inwhich said window is set.

3. A device as claimed in claim 1, said projections and said recessesbeing elongated with some of said projections disposed perpendicular toothers of said projections and some of said recesses disposedperpendicular to others of said recesses.

References Cited UNITED STATES PATENTS 2,361,398 10/1944 Harris et al.8824- 2,439,987 4/1948 Roger 88-24 2,624,231 1/1953 Kingston 88-243,242,803 3/1966 Dine et al. 88-26 NORTON ANSHER, Primary Examiner.

R. M. SHEER, Assistant Examiner.

